Make targets with specific install-type

Make targets with specific install-type

After updating Boost.Build to the latest master, I found that my install rules with explicit install-types were no longer installing make
targets. This was presumably a bug fix since make targets have type names equal to the target name, and install rules with explicit
install-types are not supposed to install any other types. So it's more consistent now. But now I need to be able to specify which make
targets to install and which not to, and it would be more sensible to be able to give them an explicit install-type for my install rule to
reference rather than change my install rule to have requirements like <install-type>MyTargetA <install-type>MyTargetB etc. Would this
change be acceptable upstream? Is this the place to make the change? make.jam (pseudocode):